Method of making screen cloth



April 1943. R. D. HELLER 2,317,457

METHOD OF MAKING SCREEN CLOTH Original Filed May 23, 1941 j I 2 as f 83 7 7' 2/3 IQICHAED D. HELLER,

HTT'Y Patented Apr. 27, 1943 UNITED STATES PATENT OFFICE- sm'rnon or MAKING scams clmn Richard D. Heller, Columbus, Ohio Original appl cation May 23, 1941, Serial No. 394,846. Divided-and this application October 15, 1941, Serial No. 415,040

. 3 Claims. This invention relates to screen cloth, and one of the objects of the invention-is an improved method of making a unique screen cloth which is particularly adapted for use in vibratory applurality of contiguous metal cross-wires and soldering a cross-strip to all of the wires to produce a cross-strip composed of such cross-wires and said cross-strip soldered to each other and soldered to the parallel wires of the screen andthereby reduce to a minimum the tendency of the cross-strip to become detached during operation of the screen cloth.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawing:

Fig. .1 is a plan view of a completed screen I cloth embodying my improvements;

. Fig. 2 is an enlarged edge view of one of the intermediate cross-strips shown in plan in Fig. 1;

Fig. 3 is a side view of the screen cloth of Fig. 1;

Fig. 4 is an end view of a vibratory deck with my improved screen cloth mounted thereon;

Fig. 5 is an enlarged perspective view showing a portion of one of the intermediate cross-strips shown in plan in Fig. 1;

Fig. 6 is another enlarged perspective view similar to Fig. 5 but taken from a different angle; and

Fig. -7 is a sectional elevation of preferred mechanism for carrying out my improved method of soldering a flat cross-strip to one side of the wires of the screen cloth and a plurality of contiguous wires to the other side of the screen cloth to complete a cross-strip having a maximum engagement with surfaces of the wires of the screen cloth.

This application is a division of my co-pending application 8. N. 394,848, filed May 23, 1041, for an improvement in Screen cloth; for the purpose as bright music or piano wires.

More particularly it is the object of the present inventionto provide an improved method of attaching to a parallel wire screen cloth a of illustrating the mounting of the screen cloth shown in Fig. 1 I have shown in Fig. 4 the preferred screen cloth mounting mechanism illustrated in the drawings of my co-pending application S. N. 273,328, flied May 12, 1939, for an improvement in Screens.

The method herein disclosed relates Particularly to the construction of spaced-apart crossstrips 19, ll intermediate the end bars ll, ll, of a screen cloth comprising a plurality of substantially straight or non-woven wires preferably made of high .carbon Swedish steel known As pointed out in my Patent No. 2,220,106 granted Nov. 5, 1040, for an improvement in Screen cloth and method of making same, this type of screen cloth wire is very hard and tough and consequently has a very long life inan operating screen cloth, thus making it extremely desirable for this purpose. That patent relates to improvement in the end bars of a screenof this type whereas the herein disclosed invention relates to the spaced-apart cross-strips ll, 10 intermediate the end bars, as

indicated in the above-mentioned objects of the present invention. While my improvements herein disclosed are particularly adapted for use in vibratory screening apparatus they may have a general application in various types of screening mechanisms.

As shown in Fig. 4, the vibratory deck frame I. is provided with attaching anchorages 43 v and I for receiving the end bars II and II respectively of the screen cloth shown in plan view in Fig; 1. The-attaching anchorage 43 is fixed to the deck frame whereas the anchorage is connected to screen tension mechanism N The cross-strips I9, I! serve as bearing areas between the screencloth andthe elongated strips of wood 30, 30, which rest in elongated troughs I9, I! mounted on supports secured rigidly to the cross beams one of which is shown at 23 in Fig. 4.

The method of attaching the cross-strips ll, 19 to the parallel wires 3|, ll of the screen cloth will now be described. A support 11 coextensive with the w dth ofthe screen panel 51 of Fig. 1, or coextensive with the length of the cross-strips I9, is provided with a plurality of spaced-apart lifting screws It! which are threaded through the elongated channel member II! which is also of the same length as that of the cross-strip 10.

Along the channel member I" extends a heater element I ll having a bottom plate ll! serving as a bearing strip for engagement by the upper ends of the spaced lifting screws I".

- tos strip I53.

Mounted on the heater element is an elongated metal tray I33 having its bottom lined with a strip of asbestos I33. An elongated hot plate or bar 8| rests in the tray 53 in the asbesrality of strands of wire 83 which may be of a the same constituency as wires 3|. The groove 82 is treated to preclude solder adhering thereto.

Upon supporting the screen cloth by anchoring the end bars thereof in fixed and stationary positions, and lifting the plate 11 to in turn lift the channel I45, the side strips I41, I41 may be forced against the bottoms of the wires 3|, 3| and held there with the plate 11 in fixed and stationary position. This may be done by means of the apparatus disclosed in the parent application S. N. 394,846.

With the parts adjusted as illustrated in Fig. 7, the wires 83 will be forced into intimate contact with the wires 3| and the strip of solder which is laid above the wires 3| on the wires 83, is melted, after a reasonable heating period, by the heat from the heater element |5|.

As disclosed in my parent application, Serial No. 394,846, tensioning mechanism may be applied to one end of the screen cloth while the other end is connected to a fixed anchorage so that the parallel wires of the screen cloth may be held taut during the operation of soldering the cross-strips thereto. While the solder is in molten condition an elongated rectangular strip 84 of tin plate- (sheet iron coated with tin) is laid on top of the wires 3| whereupon the electric current to the heater |5| is cut off and the solder allowed to solidify with the tin plate strip 84 soldered to one side of the wires 3| and the transverse wires 83 soldered to the other side of the wires 3|, thereby producing the cross strip connection 19.

The illustration in Fig. 2 is reversed from that of Fig. 7 because Fig. 2 shows the operating position of the screen cloth with the wires 83 on top thereof while Fig. 7 shows the wires 83 in the elongated trough 82 in the top of the hot plate 8|.

I prefer to locate the wires 83 on the upper side of the screen for two reasons. In the first place, the wires 83 are much stronger and much more durable than the tin plate strip 84, being steel piano wires of the same constituency as the .screen wires 3|, and therefore have a long life notwithstanding the fact that they are sub ject to great stresses and strains during movement thereover of the unscreened materials. In the second place, for a given width and length of cross strip the lower area of contact of the wires 83 with the solder is about 57% greater than the area of contact between the solder and the metal strip 84 and consequently the resistance against detachment offered by the wire crossstrip on top is much greater than would be offered by the plate 84 if it were placed on top.

In my copending application, S. N. 390,386, filed Apr. 25, 1941, now Patent No. 2,283,881, granted May '19, 1942, for an improvement in Apparatus for making screen cloth, as a division of my parent application S. N. 346,342, filed July 19, 1940, now Patent No. 2,283,878, granted May 19, 1942, I have described and claimed the apparatus for anchoring the ends of the screen cloth and subjecting the screen cloth to tension to hold the parallel wires taut, combined with apparatus for adjusting the elevation of the support 11 shown in Fig. 7.

In my co-pending application 8. N. 273,328, filed May 12, 1939, for an improvement in Screens, I have disclosed and claimed. the mechanism shown in Fig. 4 for mounting the screen on the deck of vibratory apparatus in crown formation.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I therefore wish not to be restricted to the precise construction herein disclosed. I

Having thus described and shown an'embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. The method of soldering a cross-strip of a plurality of wires to the wires of an unwoven parallel wire screen panel which comprises the positioning of the cross-strip of wires at one side only of the screen panel by fitting the crossstrip of wires in a shallow fiat bottomed rectangular trough in a hot plate with each of the last-named wires in contact with the next adjacent wire, and soldering the said cross-strip of wires to the screen panel by applying suiiicient heat to the said hot'plate, while the flat bottom of the said trough holds the wires of the cross-strip in contact with the wires of the screen pa el and while the spaced-apart vsides of the sa d trough hold the cross-strip with each wire thereof in contact with the next adjacent wire.

2. The method of soldering cross-strips to the wires of an unwoven parallel screen panel which comprises the positioning of a plurality of crosswires at one side of a screen panel by placing the cross-wires in an elongated trough of a, hot plate in parallelism with each other and bringing such wires in the trough in contiguous relation with only one side of the screen panel, said trough having a depth approximately equal to the diameter of each of said cross-wires and a width approximately equal to the combined diameters of said cross-wires so that the wires in the trough occupy a plane parallel to a plane extending through said panel wires, and soldering the cross-wires to each other and to the wire strands of the screen panel by applying heat to said hot plate. 7

3. The method of making screen cloth which comprises attaching connecting end bars to a plurality of parallel strands of wire to form an unwoven plane screen panel, subjecting the panel to tension by exerting a pulling force on one connecting bar while the other is anchored, holding a plurality of contiguous cross-strip wires in rectilinear rectangular formation in a plane parallel with the plane of the screen panel with each wire in contact with the next adjacent wire and with all of the cross-strip wires in contact with the wire strands of the screen panel on only one side of the latter intermediate the connecting bars thereof, and while the cross-strip wires are thus held soldering them to said screen panel wires on said one side and to each other to rigid-' ly connect the cross-strip wires to the screen panel wire strands. Y

RICHARD D. HELLER. 

